Reading (Odian Book):
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Reading (Odian Book): Chapter 1. Polymer Parameters. Chemical structure Chemical composition and distribution Sequence length and distribution Molecular weight and distribution Chain isomerism Morphology Topology Additives Cost. Chemical Composition. Chemical Composition.

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Reading (Odian Book): Chapter 1

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Reading (Odian Book):

Chapter 1


Polymer Parameters

  • Chemical structure

    • Chemical composition and distribution

    • Sequence length and distribution

  • Molecular weight and distribution

  • Chain isomerism

  • Morphology

  • Topology

  • Additives

  • Cost


Chemical Composition


Chemical Composition

  • Infinite chain model notation

  • How best to characterize?

  • Why does sequencing matter?

  • Synthetic approaches?

  • Compositional distribution?

  • Branching? (refer to as topology…)


Polymer Parameters

  • Chemical structure

    • Chemical composition and distribution

    • Sequence length and distribution

  • Molecular weight and distribution

  • Chain isomerism

  • Morphology

  • Topology

  • Additives

  • Cost


Molecular Weight

Property “X”

Molecular Weight

“X” = tensile strength

density

Tg

etc


Molecular Weight

Σni Mi

Σwi Mi

Mn =

Mw =

Σni

Σwi


Molecular Weight

Σni Mi

Σwi Mi

Mn =

Mw =

Σni

Σwi

  • Populations

    • Memphis, TN700,000

    • Montrose, CO 10,000

    • Effingham, IL 12,000

    • Freeman, SD 1,500

  • What is the Average Population?

    • 723,500 ÷ 4 = 180,875

    • Of these four cities, the average citypopulation is 180,875

  • Let’s think about the people…

  • What size city does the average person among these populations live in?

    • The average person does not live in a town of a population of 180,875…

    • Most of the people live in a town with a lot more than 180,000 people…

    • Need a weighted average


Molecular Weight

Σni Mi

Σwi Mi

Mn =

Mw =

Σni

Σwi

  • Populations

    • Memphis, TN700,000

    • Montrose, CO 10,000

    • Effingham, IL 12,000

    • Freeman, SD 1,500

  • Weighted average

    • 700,000 ÷ 723,500 = 0.9675

    • Take fraction and multiply that by the population of Memphis 0.9675 x 700,000 = 677,263

    • Do the same for the others

      • 700,000 x 700,000 / 723,500 = 677,263

      • 10,000 x 10,000 / 723,500 = 138

      • 12,000 x 12,000 / 723,500 = 199

      • 1,500 x 1,500 / 723,500 = 3 677,603

    • The average person lives in a city of about 677,600

    • More realistic than saying the average person lives in a city of 180,000!


Molecular Weight

Σni Mi

Σwi Mi

Mn =

Mw =

Σni

Σwi

  • What is the significance of the spread?

  • Polydispersity index (PDI)

  • PDI of polypeptides and DNA

  • How does magnitude of MW relate to synthesis?

  • How do you control PDI?


Molecular WeightDistribution


Gel Permeation Chromatography

  • What is principle behind GPC?

  • Direct or indirect method?

  • Why so useful?

  • Drawback?

Detector Response

Elution Volume (mL)


Time of Flight Mass Spectrometry (TOF-SIMS)


Time of Flight Mass Spectrometry (TOF-SIMS)


Time of Flight Mass Spectrometry (TOF-SIMS)


Polymer Parameters

  • Chemical structure

    • Chemical composition and distribution

    • Sequence length and distribution

  • Molecular weight and distribution

  • Chain isomerism

  • Topology

  • Morphology

  • Additives

  • Cost


Chemical Composition Distribution (CCD)

  • Interplay between CCD and MWD…

  • How to measure?

  • Ramifications?

    • Catalysis?

    • Phase separation?

    • Optical properties?

    • Degradation rates?

    • Toxicity?

  • Sequence length distribution


Polymer Parameters

  • Chemical structure

    • Chemical composition and distribution

    • Sequence length and distribution

  • Molecular weight and distribution

  • Chain isomerism

  • Morphology

  • Topology

  • Additives

  • Cost


Chain Isomerism

  • Regio-isomers

  • Stereo-isomers

  • Geometric isomers

  • Conformational isomers


Regio-isomers

defect


Regio-isomers


Regio-isomers


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